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How does DNS over HTTPS modes define usage of hosts file?
Firefox: 69.0, OS: Ubuntu 18.04.3
I noticed that when I enable DNS over HTTPS ("network.trr.mode" set to 2 - us… (read more)

How does DNS over HTTPS modes define usage of hosts file?

Firefox: 69.0, OS: Ubuntu 18.04.3

I noticed that when I enable DNS over HTTPS ("network.trr.mode" set to 2 - use DoH, fall back to DNS), *and* hostname is defined in hosts file (/etc/hosts), Firefox usage of hosts file is inconsistent and hard to predict.

If IPs defined in hosts file and obtained via DNS request differ, corresponding site/resources behaves erratically, as if Firefox chooses at random, which page components' DNS address should be resolved via hosts, and which via DoH.

I had to disable DoH for that reason.

It is possible to set up DoH, so that it used hosts records, if present, and used DNS in all other cases?

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I am trying to remove the some default search engines from Firefox. I can remove them in settings yet if I type @ then a number of search engines I don't want including B… (read more)

I am trying to remove the some default search engines from Firefox. I can remove them in settings yet if I type @ then a number of search engines I don't want including Bing Google and Amazon are still there. I think I have found the json that makes them visible: